public LogicalExpression visitLiteral()

in exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillOptiq.java [815:927]
112 lines of code
44 McCabe index (conditional complexity)

    public LogicalExpression visitLiteral(RexLiteral literal) {
      switch(literal.getType().getSqlTypeName()){
      case BIGINT:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.BIGINT);
        }
        long l = (((BigDecimal) literal.getValue()).setScale(0, BigDecimal.ROUND_HALF_UP)).longValue();
        return ValueExpressions.getBigInt(l);
      case BOOLEAN:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.BIT);
        }
        return ValueExpressions.getBit(((Boolean) literal.getValue()));
      case CHAR:
        if (isLiteralNull(literal)) {
          return createStringNullExpr(literal.getType().getPrecision());
        }
        return ValueExpressions.getChar(((NlsString)literal.getValue()).getValue(), literal.getType().getPrecision());
      case DOUBLE:
        if (isLiteralNull(literal)){
          return createNullExpr(MinorType.FLOAT8);
        }
        double d = ((BigDecimal) literal.getValue()).doubleValue();
        return ValueExpressions.getFloat8(d);
      case FLOAT:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.FLOAT4);
        }
        float f = ((BigDecimal) literal.getValue()).floatValue();
        return ValueExpressions.getFloat4(f);
      case INTEGER:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.INT);
        }
        int a = (((BigDecimal) literal.getValue()).setScale(0, BigDecimal.ROUND_HALF_UP)).intValue();
        return ValueExpressions.getInt(a);

      case DECIMAL:
        if (context.getPlannerSettings().getOptions()
            .getBoolean(ENABLE_DECIMAL_DATA_TYPE.getOptionName())) {
          if (isLiteralNull(literal)) {
            return new TypedNullConstant(
                Types.withPrecisionAndScale(
                    MinorType.VARDECIMAL,
                    TypeProtos.DataMode.OPTIONAL,
                    literal.getType().getPrecision(),
                    literal.getType().getScale()
                ));
          }
          return ValueExpressions.getVarDecimal((BigDecimal) literal.getValue(),
              literal.getType().getPrecision(),
              literal.getType().getScale());
        }
        double dbl = ((BigDecimal) literal.getValue()).doubleValue();
        logger.warn("Converting exact decimal into approximate decimal.\n" +
            "Please enable decimal data types using `planner.enable_decimal_data_type`.");
        return ValueExpressions.getFloat8(dbl);
      case VARCHAR:
        if (isLiteralNull(literal)) {
          return createStringNullExpr(literal.getType().getPrecision());
        }
        return ValueExpressions.getChar(((NlsString)literal.getValue()).getValue(), literal.getType().getPrecision());
      case SYMBOL:
        if (isLiteralNull(literal)) {
          return createStringNullExpr(literal.getType().getPrecision());
        }
        return ValueExpressions.getChar(literal.getValue().toString(), literal.getType().getPrecision());
      case DATE:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.DATE);
        }
        return (ValueExpressions.getDate((GregorianCalendar)literal.getValue()));
      case TIME:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.TIME);
        }
        return (ValueExpressions.getTime((GregorianCalendar)literal.getValue()));
      case TIMESTAMP:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.TIMESTAMP);
        }
        return (ValueExpressions.getTimeStamp((GregorianCalendar) literal.getValue()));
      case INTERVAL_YEAR_MONTH:
      case INTERVAL_YEAR:
      case INTERVAL_MONTH:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.INTERVALYEAR);
        }
        return (ValueExpressions.getIntervalYear(((BigDecimal) (literal.getValue())).intValue()));
      case INTERVAL_DAY:
      case INTERVAL_DAY_HOUR:
      case INTERVAL_DAY_MINUTE:
      case INTERVAL_DAY_SECOND:
      case INTERVAL_HOUR:
      case INTERVAL_HOUR_MINUTE:
      case INTERVAL_HOUR_SECOND:
      case INTERVAL_MINUTE:
      case INTERVAL_MINUTE_SECOND:
      case INTERVAL_SECOND:
        if (isLiteralNull(literal)) {
          return createNullExpr(MinorType.INTERVALDAY);
        }
        return (ValueExpressions.getIntervalDay(((BigDecimal) (literal.getValue())).longValue()));
      case NULL:
        return NullExpression.INSTANCE;
      case ANY:
        if (isLiteralNull(literal)) {
          return NullExpression.INSTANCE;
        }
      default:
        throw new UnsupportedOperationException(String.format("Unable to convert the value of %s and type %s to a Drill constant expression.", literal, literal.getType().getSqlTypeName()));
      }
    }